visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-07-14 15:00 
연사  
장소 E6 #1501 & Zoom 

7/14(목) 물리학과 문은국 교수 연구실에서 개최하는 세미나를 안내 드립니다.

 

- Title: Pure two-dimensional quantum electron liquid and its phase transition
- Speaker: Dr. Sunghun Kim(Institute of Natural Science, KAIST)
-  Date: Jul. 14th (THU), 15:00, E6 #1501

https://us02web.zoom.us/j/87068327099?pwd=SXlyZTRkSnhEeW1GTlFjaW45SW1nUT09

회의 ID: 870 6832 7099

암호: 977538

 

Abstract: 

Pure electrons spread in two-dimensional (2D) space can have several different phases of gas, liquid, and even solid – so called Wigner crystal, determined by their kinetic and potential energies. In quantum regime, it is expected to have diverse intermediate phases between Fermi liquid and Wigner crystal phase rendered by the quantum fluctuation with exclusive electron-electron interactions. In this regard, there have been many efforts to realize pure quantum electron phases and unveil its intriguing physics. However, the requirements to realize such quantum electrons at solid systems set a huge hurdle that the most of the experimental investigations have been limited in the classical regime so far. 

 

In this talk, I present the discovery of pure 2D quantum electron liquid formed on solid 2D electride at relatively high temperature of 10 K and its phase transition. Using photoemission spectroscopy and first-principles calculation, we characterized the dense surface electrons decoupled from the top-most layer that means free from other degrees of freedom. By reducing the density of 2D electron system, we observed dynamics change to that of non-Fermi liquid along with anomalous band deformation, accompanied by conserved translational symmetry and reduced rotational symmetry, that suggests a possible phase transition to the hexatic liquid crystal phase. These results can provide further opportunities to study the role of electron-electron interaction which can drive Wigner crystal and various intermediate phases in quantum regime
번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
425 2022-10-06 13:00    Counting States with Global Symmetry
424 2022-08-12 10:00    Twisted Bilayer Magnets file
423 2022-08-12 10:00    Twisted Bilayer Magnets file
422 2016-04-26 16:00    Transport spectroscopy for electronic bands in carbon-based nanomaterials with weak-bond contacts
421 2018-05-11 16:00    암페어 단위 재정의와 단전자 펌프 소자 개발 file
420 2025-04-22 16:00  Dr. Nanse Esaki (The University of Tokyo)  Spin Nernst and thermal Hall effects of topological triplons in quantum dimer magnets on the maple-leaf and star lattices file
419 2016-06-01 10:30    Welcome to Nature Photonics
418 2018-07-02 15:00    High Precision Magnetic Field Measurement for the Muon g-2 Experiment file
417 2015-10-16 15:00    High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble
416 2018-11-09 14:30    Moiré superlattices – from twisted bilayer graphene to quasicrystal file
415 2024-05-30 10:00    Quasiperiodic Effects in Quasicrystals
414 2024-05-16 14:30    [Astrophysics Seminar] Observational Cosmology with Superconducting Sensors
413 2022-03-29 10:00    Non-reciprocal phase transitions file
412 2022-03-31 10:00    Weiss fields for Quantum Spin Dynamics file
411 2020-10-15 17:00    Time crystals, quasicrystals, and time crystal dynamics in the superfluid universe file
410 2023-05-03 16:00    Probing microscopic origins of axions by the chiral magnetic effect
409 2022-11-09 16:00    Radio Astronomy, Radio Interferometry, and Multi-wavelength Studies on Relativistic Jets
408 2017-06-02 16:00    Maxwell's demon in quantum wonderland file
407 2015-12-03 16:00    Hybrid solid state spin qubits in wide bandgap semiconductors
406 2025-01-08 16:00  Dr. SangEun Han  Quantum impurity model for two-stage multipolar ordering and Fermi surface reconstruction